(Dynamics of vibrationally excited polyatomic molecules and their unstable isomers on the electronic ground state potential surface): Progress report
The general goal of this research is to understand the role of vibrational energy in chemical reactions related to energy production. Since the start of this grant in August 1986, we have made several advancements, both in the development of methodology and in science, toward understanding the chemical properties of highly vibrationally excited molecules. A transient vibrational spectroscopic method -- Flash Photolysis Stimulated Emission Pumping -- for radical species has been developed. The vibration-rotation levels of a radical, generated by flash photolysis at a concentration /approx gt/ 10/sup /minus/4/ Torr, and with a lifetime of /approx gt/ 10/sup /minus/8/ sec, can be characterized with 0.04 cm/sup /minus/1/ resolution over a wide energy range (up to 10/sup 4/ cm/sup /minus/1/). This method was first demonstrated on CH/sub 2/. Using Stark Level-Crossing Spectroscopy, we have shown that highly excited, single vibration-rotation quantum states of small polyatomics can be characterized with great detail. This can be done even though these levels are dissociative, have high densities, and are optically inaccessible. 17 refs., 2 figs., 4 tabs.
- Research Organization:
- Pennsylvania Univ., Philadelphia (USA). Dept. of Chemistry
- DOE Contract Number:
- FG02-86ER13584
- OSTI ID:
- 6048251
- Report Number(s):
- DOE/ER/13584-4; ON: DE89014682
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBENES
STIMULATED EMISSION
FORMALDEHYDE
DISSOCIATION
PHOTOLYSIS
PROGRESS REPORT
SPECTROSCOPY
VIBRATIONAL STATES
ALDEHYDES
CHEMICAL REACTIONS
DECOMPOSITION
DOCUMENT TYPES
EMISSION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADICALS
400201* - Chemical & Physicochemical Properties